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AN3372 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN3372
Description  This note describes digital ballast for 70 W HID lamps
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3372 Datasheet(HTML) 17 Page - STMicroelectronics

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AN3372
PFC design rules
Doc ID 018625 Rev 1
17/37
●
Maximum peak inductor current:
●
Maximum RMS inductor current:
●
Maximum RMS diode current:
6.3
Power components
6.3.1
Input capacitor
To calculate the input capacitor the following relationship can be used:
Equation 5
Using r=0.25 a commercial value of 220 nF was selected. A bigger capacitor improves the
EMI behavior but worsens the THD.
6.3.2
Output capacitor
The output bulk capacitor selection depends on the DC output voltage and the converter
output power.
Equation 6
Considering the tolerance of the electrolytic capacitors and in the capacitor divider two
capacitors are connected in series, 100 µF 250 V was selected.
6.3.3
Boost inductor
The boost inductor must be calculated at minimum and maximum Vac. The minimum
inductance value must be selected.
Equation 7
Equation 8
Equation 9
A
61
.
2
92
.
0
2
2
I
2
2
I
in
LPK
=
⋅
⋅
=
⋅
⋅
=
A
06
.
1
92
.
0
3
2
I
3
2
I
in
1
L
=
⋅
=
⋅
=
A
53
.
0
V
V
9
2
4
I
I
out
min
ac
pk
1
L
10
D
=
⋅
π
⋅
⋅
=
nF
220
85
1
.
0
k
30
2
92
.
0
V
r
f
2
I
C
min
ac
min
sw
in
in
=
⋅
⋅
⋅
π
⋅
=
⋅
⋅
⋅
π
⋅
=
F
31
20
410
47
4
70
V
V
f
4
P
C
out
out
min
out
o
μ
=
⋅
⋅
⋅
π
⋅
=
Δ
⋅
⋅
⋅
π
⋅
=
out
min
sw
ac
out
2
ac
V
Pin
f
2
)
V
2
V
(
V
1
L
⋅
⋅
⋅
⋅
−
⋅
=
mH
1
.
1
=
⋅
⋅
⋅
⋅
−
⋅
=
420
77.5
30k
2
85)
2
(420
185
L
2
1max
mH
3
.
1
=
⋅
⋅
⋅
⋅
−
⋅
=
420
166
30k
2
265)
2
(420
265
L
2
min
1



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